出生时存在,以后永不消失的反射有:()
A.角膜反射
B.腹壁反射
C.咽反射
D.提睾反射
E.瞳孔对光反射
参考答案:A, C, E
客户在期货交易违约造成保证金不足的,期货公司应当以()垫付。
A.结算担保金
B.风险准备金
C.自有资金
D.交易保证金
Teachers recommend parents ____ their children under 12 to ride bicycles to school for safety.[ ]
A. not allow
B. do not allow
C. mustn't allow
D. can't allow