农民用大蒜的蒜瓣埋在土壤里面长出葱绿的大蒜，这种无性生殖的类型是[ ]
A．营养生殖
B．分裂生殖
C．出芽生殖
D．孢子生殖
答案：A
The government must be very _____ about setting policies and make no decision until they are quite sure it is the right one.
A．particular
B．concerned
C．cautious
D．certain
买卖双方在合同中规定：“按交货日的伦敦金属交易所的结算价计算。”这是固定作价的一种规定方法。
