题目内容：

Students at the Florida high school where 17 people were shot dead in February of 2018 are being asked to wear clear backpacks.

School officials have written to families of Marjory Stoneman Douglas High pupils outlining the plans as part of new security measures, They say any student without a clear backpack will be given one at no cost. As well as introducing the transparent backpacks for quicker safety checks, there will also be airport-style metal detectors and school visitors will pass through special gates.

“We’re going to man every gate at the school during school hours and for after-school activities,” said the superintendent of Broward County Public Schools, Robert W. Runcie.

Since the shooting when Nikolas Cruz opened fire killing 17 people, students there have been leading calls for gun reform.

Donald Trump has told US politicians he wants tougher laws with “really strong background checks”, while he’s faced anger from anti-gun groups for suggesting training school staff to use firearms.

In the last few days, safety at Marjory Stoneman Douglas High has been called into question again after several security breaches (违反). Three students were arrested on Tuesday, two for carrying knives and one for making threats on Snapchat. Some parents have become so worried that they’ve been keeping their children off school.

“We’ve got to put things into place now,” Mr Runcie said.

1.Which is a new security measure of the school?

A. Teachers are trained to use firearms.

B. Guards are hired to monitor the students.

C. Visitors are forbidden to enter the school.

D. Students are required to wear clear backpacks.

2.What can we know about the school shooting from the text?

A. The gunman was a school staff member.

B. One of the victims was named Nikolas Cruz.

C. Seventeen people were shot dead on campus.

D. Someone unknown broke in and opened fire.

3.Some parents have become worried because       .

A. three students were badly hurt

B. the school takes few safety measures

C. they received a letter from the teacher

D. there are still safety problems at the school

4.What is the students’ attitude toward firearms?

A. They call for changes of gun laws.

B. They are against the school’s stricter rules.

C. They defend their right to possess weapons.

D. They approve of Donald Trump’s suggestion.