人们在劳动实践中可能发生的错觉有哪几种（）
A.视错觉
B.大小重量错觉
C.空间定位错觉
D.颜色错觉
参考答案：A, B, C, D
用所给词的适当形式填空。
1.His father worked for thirty hours without ________(stop).
2.My sister enjoys ________(read) very much.
3.Lei Feng is well-known for ________(help) other people.
4.His grandmother ________(bury) in his hometown, Shandong Province.
5.The Anti-Japanese War was one of the most important ________(event) in modern Chinese history.
CNG加气枪加气枪阀的叠心弹簧是由（）片曲面的金属垫片组成的。
A、2
B、4
C、6
D、8
