题目内容

目前全世界范围种植面积最大的转基因作物是？

A. 大豆
B. 棉花
C. 玉米
D. 油菜

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植物基因工程中的Bt基因来源于苏云金芽孢杆菌。

A. 对
B. 错

基因工程育种具有周期短，不受物种限制的特点。

A. 对
B. 错

Reading :Complete the sentences with words or expressions according to the text.1. Have you ever the dream of ()the world when you were a child ?A.healing B. heal D.to heal2. We have ()on our panda care program in Chengdu Research Base of Giant Panda BreedingA.room B. spaces C. area3. No experience is ( )as training will be given.A.need B. to needC. needed4. All volunteers will ( )with a souvenir badge at the end of their stay. .A.be presented B. being presented C. presented5. Volunteers ()to protect this beautiful yet fragile marine environment.A.required B. require C. are required6. You should ()rubbish in the sea and on the beachA.pick up B. pick down C.pick out7. You will visit local schools and communities( ) the importance of protecting the marineenvironment.A.to explain B. explaining C. explain8. Volunteers must ( )their own travel .A.pay off B. pay for C. pay up9. If you work on the panda care program, your ()is providedA.travel B. clothes C. accommodation10. All volunteers must be strong swimmers and ( )valid health certificates .A.want B. possess C. hold

1.关于位移与路程的关系，下列表述正确的是？

A. 位移等于路程。
B. 位移的大小等于路程。
C. 直线运动中，位移的大小等于路程。
D. 单向直线运动中，位移的大小等于路程。