题目内容：

    Studies show that language learning in babies is improved when parents speak more than a few simple words and use a wider vocabulary(词汇). Earlier research found that the style of speech used by parents to communicate with their baby could increase language development.

One such speaking style is known as "parentese". Research has shown that babies react (反应) better to this kind of language in the first months of life. Generally, "parentese" requires adults to speak in a higher voice and at a slower speed. The language is made easier to understand, while sentences are short and often repeated.

Can parents be taught good ways to improve their "parentese" skills? Patricia Kuhl, a professor of speech and hearing sciences, carried out a study on it. She says the purpose of the study was to find out whether a parent can be "trained" to create their own speaking style to improve language learning in children.

Naja Ferjan Ramirez helped lead the study. "Most parents know that the amount(数量) of language their child hears is important," Ferjan Ramrez said. "What we shared with them through training is that how they talk to their baby may matter even more."

For the study, parents were given a small recording device(设备), which they put inside a piece of their baby's clothing. All spoken communication from parents and the child was recorded. The recordings were made at three different periods of the child's life: when the child was six, ten and fourteen months old. The parents were divided into two groups: a control group and an intervention(干预) group. Those in the intervention group received training after their six and ten month recordings.

The study found that between the ages of six and fourteen months, trained parents increased the amount of speech directed to the child and their use of "parentese" by 15 percent. Parents in the control group showed less growth in those areas, about 7 percent.

1.What can parents do to improve their baby's language learning?

A.Communicate with their baby with a few simple words.

B.Communicate with their baby with a wider vocabulary.

C.Communicate with their baby using longer sentences.

D.Communicate with their baby in a gentle voice.

2.What can we learn about "parentese" from the text?

A.It means that adults talk with their babies in a lower voice.

B.It means that the language parents use becomes more difficult.

C.It means that adults talk with their babies more quickly.

D.It means that the sentences parents use are short.

3.According to Ferjan Ramirez, what do the researchers want parents to know about through training?

A.The importance of the amount of language their child hears.

B.The importance of the type of language their child understands.

C.The importance of the way parents talk to their children.

D.The importance of high and low voices when parents talk to children.

4.What is Paragraph 5 mainly about?

A.What the study needed. B.How the study was carried out.

C.The reason why the study was carried out. D.The advantages of the study.

5.What can be concluded(推断) from the study mentioned above?

A.Trained parents are more likely(可能的) to improve their children's language learning.

B.Six to fourteen months is the best time to improve children's language learning.

C.Parents in the control group used more "parentese" than in the intervention group.

D.Trained parents needed to use "parentese" for at least fourteen months.