相同条件下，相同浓度的盐酸分别与镁、铝、铁3种金属恰好完全反应，产生相同体积的氢气（相同状况下），则下列说法正确的是( )
| A．开始时，产生氢气的速率相同 | B．所得溶液的pH值相同 |
| C．所得溶液的质量相等 | D．参加反应的金属的质量比为12∶9∶28 |
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
Charles was alone at home, with_______ looking after him.
| A．someone | B．anyone | C．not one | D．no one |
It is often ______ that human beings are naturally equipped to speak.
| A．said | B．to say | C．saying | D．being said |
| A．果脯（fǔ）倾轧（yà）供不应求（gōng） |
| B．模型（mó）殷实（yīn）寡廉鲜耻（xiǎn） |
| C．宝藏（zàng）间断（jiàn） 浑身解数（jiě） |
| D．澄清（chéng）包扎（zā）相形见绌（chù） |
| A．间jiàn黑白相间亲密无间居间调停 |
| B．挨āi挨门逐户挨打受骂延挨度日 |
| C．劲jìng疾风劲草强劲有力刚劲正直 |
| D．舍shě舍我其谁不舍昼夜魂不守舍 |