汛期渠道水位、流量的控制应在灌溉期控制标准的基础上适当（）。
A、降低
B、提高
C、不变
D、视情况而定
参考答案：A
I recommended ________ an English-Chinese dictionary, which I thought would be of great help to his studies.
A．him buy
B．he bought
C．to buy
D．buying
种子质量监督抽查样品，同被抽查企业无偿提供，扦取样品数量不得超过检验的（）.
