题目

请认真回忆物质与其构成粒子之间的关系，回答下列问题： （1） 金属铁是由构成的，氯化钠是由构成的，二氧化磷是由构成的。（填“原子”、“分子”或“离子”） （2） 原子得到或失去电子后形成离子。某粒子的结构示意图为： ①当a=时，该粒子是原子，该原子化学性质。 ②当a=19时，该粒子是（填“原子”、“阳离子”或“阴离子”），所对应元素位于元素周期表中第周期。　　Students must apply（申请）for a place before attending any class. Applications whether by post or in person, are dealt with strictly in the order they are received at the Adult Education Office. 　　You can apply: 　　By post-- use the card supplied with the exact fee（费用）. You will be accepted on the course unless it is full, in which case we will inform（通知）you. 　　An acknowledgement（承认）will not be made nor a receipt（收条）sent unless you supply a stamped addressed envelope. Receipts will normally be given out at the first class. 　　In person-- call at the Adult Education Office (ground floor, C block) between approximately 9∶00 a. m. and 3∶30 p. m. (2∶30 p. m. on Fridays), or at the College Reception Desk (at the main entrance) at the other time (in the evenings until about 7∶30 p. m. -- not Fridays). 　　Students should note that popular classes may be full well before the course is to start, so that early application is strongly advised to avoid（避免）disappointment. 　　For the Autumn Term, applications will be accepted by post (better) or in person from August 1. 　　For the Spring Term, applications will be accepted from December 1. 　　For the Summer Term, applications will be accepted from April 1. (1) Students who apply to the college by post will ________. [　　] A．avoid disappointment B．be sent a bill C．have an advantage over people applying in person D．be informed if they have not got a place (2) Which of the following words has the closest meaning with the underlined word“approximately”in this notice? [　　] A．closelyB．about C．mostlyD．probably (3) When and where can students apply in person? [　　] A．At the College Reception Desk after about 3∶30 p. m.. B．At the Adult Education Office after about 3∶30 p. m.. C．At the Adult Education Office at 9∶30 p. m. D．At the College Reception Desk at 2∶00 p. m. on Fridays. (4) If the students want to apply for the Autumn Term, ________. [　　] A．they should check whether the course is full B．the college would rather they applied by post C．applications must be received by August 1 D．they must apply in person