三．语法填空。(每空2分，共20分)

1   (follow) Jane’s way of studying chimps, our group   2   all going to visit them in the forest. Jane has studied these families of chimps for many years and     3    (help) people understand how much they behave like humans… Everybody     4   (sit) and   5 (wait) in the shade of the trees while the family   6   (begin) to wake up and move off.

… …

Nobody before Jane  7 (full) understood chimp behavior. She spent years _8___ (observe) and   9   (record) environment. However, this was not easy. When she first arrived in Gombe in 1960, it was unusual for a woman to live in the forest. Only after her mother came to help her for the first few months   10   she allowed to begin her project.

如图是电场中某区域的电场线分图，a、b是电场中的两点．这两点相比，有（　　）

A．b点的场强较大

B．a点的场强较大

C．同一个检验点电荷放在a点所受的电场力比放在b点时所受电场力大

D．同一个检验点电荷放在b点所受的电场力比放在a点时所受电场力小