horsemeat out of products
the food safety
the test food
the food sale
第1题:
must have looked after
would have to look after
had to look after
should have looked after
第2题:
what I am supposed to do
how should I protect our home
why it can cause such bad weather
第3题:
第4题:
第5题:
光电子的最大初动能减小
光电子的最大初动能不变
单位时间内产生的光电子数减少
可能不发生光电效应
第6题:
第7题:
9
11
14
16
第8题:
Because the river is polluted
Because the river makes the earth more beautiful
Because the river can only offer water to animals
Because there are too many animals and plants in the river
第9题:
will object
objects
had objected
objected
第10题:
fight
keep
have
get