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单选题

A．They attack members of their own nests.
B．They recruit ants from other species into their nests.
C．They form large colonies made of several nests.
D．They hide from insects that attack their nests.

参考答案C

解析: What's the characteristic of Argentine ants in California?
细节题。根据But the Argentine ants living in California behave differently．Ants from different nests form a singlelarge colony．可知，在加利福尼亚的阿根廷蚂蚁的特点是，它们会形成大群体。因此，正确答案为C。

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单选题

A．They share the same few ancestors.
B．They can't be distinguished from native Californian ants.
C．They are evolving faster than native Californian ants.
D．Their future survival is in doubt.

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单选题Questions are based on the following passage.
It's widely agreed that girls generally start talking earlier than boys, and use more complex vocabulary. When they. 26 school, most girls have slightly better verbal skills than boys--on average, they are a month or two ahead.
As they progress through primary school, girls continue to 27 boys when it comes to verbal skills. By the time children leave primary school, girls are about a year ahead with reading and the 28 is even bigger for writing. However, it should be noted that boys are roughly 29 with girls when it comes to attainment in maths at primary school.
The gap in attainment at the age of 16 had led some teachers to believe that single-sex lessons in core subjects are the way forward when it comes to 30 male students and improving boys' grades. They argue that boys, for instance, feel less 31 in subjects like literacy when there are no female students in the classroom to compete with.
Others believe that girls and boys thrive best when the opposite sex is taken out of the equation completely, and 32 a single-sex environment, especially at secondary school level.
Some schools believe that a male 33 -whether it is a male teacher or more involvement from dad at home--is a key factor in impelling boys and improving their grades. Others advocate a more "boy-friendly" environment at school, whether it's 34 more books in the library that appeal to boys or trying out different teaching styles in lessons to 35 boys in learning.
A. presence
B. identical
C. outperform
D. stocking
E. gap
F. motivating
G. disheartened
H. sorry
I. level
J. engage
K. cheering
L. recommending
M. advocate
N. start
O. Aooearance
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