题目内容：

Smart Kids Festival Events

Smart Kids is a collection of one hundred events scheduled in October. This year, it is experimenting with Pay What You Decide (PWYD). That is, you can decide to pay what you want to or can afford, after you have attended an event. You can pre-book events without paying for a ticket in advance. Here are some of the director’s picks.

Walk on the Wild Side

Not ticketed, Free

Join storyteller Sarah Law to hear science stories about animals. Along the way you’ll meet all sorts of beautiful creatures and discover life cycles and food chains. Best suited to children aged 5-9. Children under 8 must be accompanied by an adult.

Introduction to Waves

Pre-book, PWYD

Subjects range from sound waves to gravity waves, and from waves of light to crashing waves on the ocean. Mike Goldsmith explores the fundamental features shared by all waves in the natural world.

Science in the Field

Not ticketed, Free

This storytelling night features a scientist sharing his favourite memories of gathering first-hand data on various field trips. Come along for inspiring and informative stories straight from the scientist’s mouth. Join Mark Samuels to find out more in this fun-filled workshop.

Festival Dinner

Pre-book, £25 per person

Whether you want to explore more about food, or just fancy a talk over a meal, join us to mark the first science festival in London. Which foods should you eat to trick your brain into thinking that you are full? Find out more from Tom Crawford.

1.In which event can you decide the payment?

A. Walk on the Wild Side

B. Introduction to Waves

C. Science in the Field

D. Festival Dinner

2.Who will talk about experiences of collecting direct data?

A. Sarah Law.

B. Mike Goldsmith.

C. Mark Samuels.

D. Tom Crawford.

3.What do the four events have in common?

A. Family-based.

B. Science-themed.

C. Picked by children.

D. Filled with adventures.